To know if your location is good for Geodnet. Please visit the Geodnet explorer map here: Click here
Zoom into your location you wish to install the unit. If you don't see any dots in your hex you are good. See photo below.
A location with existing dots means your rewards would be lower. See photo below.
You want to be the only user in the hex, so you can secure the location NFT. That means nobody can affect your rewards when you hold the NFT, so if someone installs a unit later in your hex, you won't suffer.
A good installation would be up high, without anything around it block the view of the sky. This is important as it affects your ability to get the location NFT. See photo below.
For more information you can read here from the official Geodnet Docs: Click here