Hello @Audiophile,
We use in our own place a Balance ONE, our place is double story with concrete floor, brick walls and plenty of interference around the area on the Wi-Fi spectrum, in a separate building out the back is a small warehouse (the size of a double garage). The Balance ONE resides at the front of the place down stairs.
From this single Balance ONE we have connectivity to our vehicles parked out the front in the street, connectivity to portable devices out the back in the Warehouse and connectivity through out the rest of the place. Due to landlord restrictions we have to run everything via wireless, bandwidth is a challenge at the coverage extremes, though we have not need to add any additional equipment to date.
If you are looking to start with something simple, the Balance ONE is a great place to begin and is feature packed.
Happy to Help,
Marcus 