If you’re setting up a miner for the first time and your location is near the boundary of a Hex, you have the flexibility to pick either the location you’re exactly in or an address close by – in the neighboring hex.
But does it really matter?
The answer is – It really does not matter as long as you’re no further than about 100 meters away.
It’s also important to remember that transmit scales (that depend on the number of hotspots in your hex) affect hotspots that witness your beacons, so it will affect others more than you. At the same time however, you will get less rewards from sending beacons. But this is not going to impact your earnings by very much.
The reason for this is that most rewards come from witnessing other hotspots. Hotspots only beacon 2 or 3 times a day on average – sometimes even less. However a miner with a good antenna will witness beacons many, many more times a day.