Up to 3 google homes now, one in the kitchen, one in the basement, and one in the bedroom. The kitchen one I might move so that I can use it from the kitchen area or living room. There's a short hallway between them that I could mount this up near the doorbell chime, or something. There should be a 3rd party mount bracket for mounting it to a wall. Also up to 3 zwave dimmer switches, and 3 add on 3 wave switches. I've been buying a few each week and putting them in. No issues so far, except with room naming. Some rooms have 5 banks of light switches and coming up with names to control them that I can remember can be fun. For example, in our front/main room, we have 2 entryway lights on a switch, a chandelier over the formal dining room table, a set of 4 lights that separate the dining room and living room, a ceiling fan in the living room with 2 lights in it, a directional floodlight over the fireplace, etc.
In the kitchen we have 5 lights near the cabinets, 3 lights over the island, a breakfast nook with ceiling fan and lights, another ceiling fan in the open concept kitchen/family room, another bank of 4 lights past that ceiling fan, another directional floodlight over the see through fireplace, etc. I really need to clean up and take a video of the house. It's bizzare how many light switches we have and placement of the lights.