You mentioned an office, is this a business connection, as there is usually more flexibility allowed on a business premises?
The FTTP engineers are normally pretty flexible. They will discuss the installation with you and will try their best to meet your needs.
As an aside you must make sure a double scocket is free for the ONT and battery backup. You will also need one for the router. If you are placing the router elsewhere in the room make sure you have an ethernet cable long enough to stretch frum the ONT to router.