A good tip is what Custom-X_Sponjah (what the hell is a Custom-X_sponjah?) mentioned is to make the "range" look as innocuous as possible.
If a stranger is sneaking around on the land (or the cops show up for any reason) there should be zero indication to a quick look-around that there has been shooting going on.
A big pile of dirt with a shovel laying next to it with corresponding color/consistency dirt sprinkled around a garden or flower patch will look like landscaping where laziness struck, not a backstop for rifle fire.
Setting up a clothesline between the dirt pile and house (if there's going to be a residence on site) gives you a place to hang targets, or you could use that orange construction netting and put the netting around the dirt pile ("for safety or to keep animals off") to hang targets on.
When I go shooting here (moderately populated patch of county land surrounded by incorporated city) I staple targets to trees and fire at a downward angle (about 20-40 degrees down from where I shoot to where the targets are, depending on the tree I staple them to) so I have a series of trees, hills, and the ground itself as my backstop. The direction I'm firing in is towards an undeveloped mountain with all the residential area to my rear.
If anyone shows up the only indication of gunfire is the couple of trees I've cut down (god, i love AK-47s and .357s
) and random shell casings I failed to pick up and chuck into the woods.
Oh, plus the Yankee vermin that move down here love to call 911 when they hear gunfire, but the Sheriff's Department either lies to them on the phone and pretends to dispatch someone or they tell them to STFU because I havent had a Deputy show up in about 8 years.