There are tons of elk on the Manti and Fishlake units, but for otc you would be limited to spike or cow. Guys have been complaining about the herd declining on the wasatch the last few yrs, lots of rifle cow tags have been given out.
I have not hunted the Manti or the Wasatch but have hunted Fishlake. Most guys don't get over a mile from a road or atv trail and there are quite a few atv trails. Some spots can get quite crowded, I have buddies that shoot wheels and the last couple yrs before they could get to the animal someone else had claimed it. But they were within that mile of an atv trail. Most guys hunt on the public adjacent to private, the elk will drop onto private if pressured to much.
Lots of other spots though and if your willing to go back a little ways you'll lose the other hunters.