WiiM amp + recommendations

Recently purchased a new home. The home has 4 separate locations with speakers that have all wires come back to a central location. 2 of the locations are in close proximity of each other so in doing research I found that since all 4 speakers are 8-ohm a WiiM amp should have no problem powering all 4 so they all Play the same sounds at the same time. The other 2 locations are separated and would require two different amps or 1 amp with multi zones. So the current set up is 1 WiiM amp powering 4 (8-ohm speakers) and The other 2 locations are not powered up.

I really like the WiiM interface and how user friendly it is. The price tag is a bit much for the other 2 locations. Are there any recommendations to keep the WiiM interface for the other two locations but use a less expensive amp? Can the WiiM amp connect to another multi zone amp? Or would multi zone amp with a WiiM mini work? Or is my best bet just 2 more WiiM amps?

I’m less concerned about sound quality more like the ease of use function. I also don’t want to have too many boxes needing to get plugged in.