I'll share some insights from the experience with mobile proxy farms using mobile phones.
In this case, the choice of location depends solely on the quality of the mobile signal. Usually, there are no problems with signal cover in cities, so most of our proxy farmers set up their farms at home. It doesn’t take up much space since it's essentially just a few phones with chargers connected.
Many keep the farm at home even when it grows to several dozen phones. As the scale increases, they might hire assistants to manage the farm or rent a small space in an office building or a garage, or make arrangements with a friend’s office to set up there.
Some of our farmers have even used old vans and simply parked them near a mobile tower. And some people store rows of phones on the windowsill, ensuring both good signal and cooling, lol.
However, if you're talking about a farm that relies on your own servers, things get more complicated because having a high-quality internet connection to the server is crucial. In this scenario, not every home will be suitable ofc.