Our tripod and dish are similar to the 1st photo. Our backing arm is in the 2nd photo (bracket on the right isn't used). Adjusting elevation and azimuth requires loosening the bolts and re-tightening when aimed as accurately as possible at the satellite. If I loosen the bolts even slightly too much, the dish can suddenly slip too much. If slightly too tight, it's really hard to move the dish.
Finding the right HD satellite initially isn't the hard part, it's the fine tuning to get the strongest signal that I'm finding isn't easy and fiddling with the bolts is a pain.
The 3rd photo is one adjustable bracket on ebay but it doesn't have 4-bolt mounting to match our dish. Something like this would work and maybe I could make an adapter if I can't find a similar to fit our dish.
Only have one LNB for one satellite and don't need to set the skew. Am using the Winegard signal finder which takes time to adjust, move the dish a little, and readjust until you have a good signal. The Birdog meter looks nice but at a few hundred $$ isn't cheap.