When we bought our current house the realtor pointed out that most of the rooms were pre-wired for a whole-house audio system. However, these types of installs use rather small gauge wiring which require different amps that run on a higher voltage, otherwise, for a “normal” amp, you would use 12 gauge wire and short runs. When you say, “the speakers will be in place”, is the builder taking care of the install? If so, I’d ask who they used and get a recommendation on the amp from them.
I already had two high-end systems for the living room and bedroom when we moved in (and I’ve since re-purposed another amp for the garage). The living room amp had the option for a 2nd zone which I used to power patio speakers. Echo dots then allowed me to play music simultaneously on all three systems which covered the majority of the house. Unfortunately, the Fire TV Cubes I bought to replace two of the Echo’s do not allow for multi-room play. However, the Cubes do have built-in IR controllers so I can switch inputs and adjust the volume using voice or the remote (or newer amps are also Alexa ready). My living room amp also lets me play different inputs to the 2 zones simultaneously which is pretty much standard.