It is possible to have a registered office in the care of Registration Office Agent (ROA). The agent must have been previously approved by the CRO and the registered office will remain that of the ROA until such time as the company files a Form B2 to update the registered office address and to remove the agent.
https://practicenet.ie/practicenet/business-guides/pdf-file/...
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https://www.cro.ie/Home/Search-Results?sb-search=roa&sb-inst...
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Registered Office Address

Every Irish company must have a Registered Office Address (ROA) at which official documents can be served and this address should be displayed on all business letterheads of the company.

This is the official address of your business where all official documents are served. This does not have to be your trading address but it must be located in Ireland, residential addresses are permitted. The registered office address must be a physical location, P.O. Box numbers are not permitted as a registered office.

The Registered Office of your company is the address for your company which is recorded with the Companies Registration Office. Official documents, such as documents from the courts, are served on a company at its registered office and official correspondence is usually sent to the registered office, for example official letters from the Revenue Commissioners and the Registrar of Companies.

The provider of your registered office address is very important since as they receive all documents from both the Revenue Commissioners and the Companies Registration Office and should be capable of advising and or dealing with such official correspondence.

Please note that this address should not be used for any trading purposes or general correspondence, or for any form of advertising. The address is only to be used to comply with the requirements of the Companies Act 2014 in relation to official mail and documents.
https://www.formacompany.ie/en/company-secretary/registered-...

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Note added at 2 days 20 hrs (2019-09-06 10:41:59 GMT)
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Authorisation of Registration Office Agent - B81
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As a Registered Office Agent, we will maintain an office in the State at all times and this office will also act as the registered office for companies, that under section 50(4) of the Companies Act 2014, have submitted the necessary form B2 or form A1 or equivalent

Our registered office address, stated below, to be used for the associated companies, can only be updated by the registration of a B2 form following the requirement of Section 50 to submit the document in a timely manner within 14 days.
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Under section 50(4), a company's registered office may be placed in the care of an agent who has an office in the State and is approved for this purpose by the Registrar of Companies. To become an approved ROA, the agent must file this form B81 with the CRO. The agent must be an Irish registered company and their company number will then become their ROA identification number.

Companies who wish to use the agent's address as their registered office will be required to consent to the agent's appointment as their ROA by including the registered agents name, number and address on the Form B2 (change of registered office) or form A1 (incorporation document) or equivalent to form A1 (SE forms or Q form). The appointment form must be signed by an officer of the company and filed with the CRO.