JS, Welcome to the board.
It's difficult to be accurate when making generalities, especially when they involve coyote behavior, and there are certainly more experienced guys here than me, but I'll give it a try.
If there is any breeze, coyotes will often (not always) try to get downwind of an interesting sound source. If they "wind" you, they will, more often than not, kick in the afterburners. This can make for some very difficult shooting. For this reason, most guys try to catch them (and stop them) before they have circled downwind, if they can.
I generally assume that any coyotes that were downwind of me when I started calling will never be seen anyway, though I have seen them come in at a run from downwind (rarely).
If I was hunting alone with hand calls, in the terrain you describe, I would try to set up where the likely paths the coyote would take (fence lines, ditches, roads, trails, firebreaks), would be upwind or cross wind from me. The theory is that you should see them before the enter your scent cone, and lip squeak, or bark them to a stop for a shot.
Depending on the terrain, I like to set up crosswind, with the wind coming slightly from my right. I am a right hand shooter, and this allows me to more easily take shots to my left, on dogs that are trying to wind me.
A decoy can also help. If the decoy attracts their attention, that is what they will often focus on and if it is in the open, they may not even try to wind it. I like to set it a few feet off the ground, on a stake or branch, out in the open, a few yards downwind of the cover I think they are likely to be coming out of.
Hunting with a partner can also "up your score". You still won't have 360deg coverage, but it will be much better. Two guys calling at the same time also seems to work well, for some reason.
There is, of course lots more to it, and I'm some other guys will chime in. In the end, however, if whatever you are doing is working, well.....