Practicing to get better at a getting off fast accurate shots, no matter the position, has no downside.
One buck I killed last year was below me and busted me before I saw him. He was about to take off and he'd be gone with no shot opportunity. Ranged him, dropped to the ground, got into my rifle and killed him. It was over in a small handful of seconds. That's just one example.
I see this several times a year in AZ and in Mexico...
A lot of hunters take forever to get a shot off. They tend to be "curvy" so they cannot get comfortable on the ground; worse with rocks, cactus, roots, bugs, etc. This leads to a lot of fidgeting. They have a horrible process of identifying the location of the animal and getting the rifle on the animal. This leads to more fidgeting, moving back and forth between the rifle and optics. More messing around with trying to get them to spot where the animal is. Kick them out of the rifle, put them crosshairs on the animal and tell them to not move the rifle. They are suddenly deaf so they move the rifle and the poop show starts all over again. Eventually they settle down, they are in the rifle, the crosshairs are on the animal and now they cannot see the animal. Animal either then dies of old age or the shooter finally gets his head out of his butt and takes the shot.
Do practice the entire sequence and get it down to a handful of seconds. If you have to take the shot right away, you're all set. If you have to wait for a shot, no worries.