Basketball players would do well to learn from boxers and dancers. Both boxers and dancers use mirror work to improve their techniques, footwork, coordination and alignment.
Working in front of a mirror to improve your shooting technique can be a very powerful tool. You should be able to observe your shot from the front and both sides. If you had to mirrors facing each other you could also look at your alignment from the back.
If the mirrors are long enough you can even focus on your footwork, making sure you are shoulder width apart, that you are powering up through both feet etc.
You don’t need to go to a facility that has full length mirrors. You can check out your shooting mechanics in your bathroom with or without a ball. When I was young and working on my game outdoors at the local school, I would practice my form looking at my reflection in the school window. I would also work on my ball-handling doing the same, looking in the window at my reflection. Great way to keep your head up.
Hey if you have a video camera and you have someone willing to shoot you will you work out from front, back and both sides, fantastic. Sometimes you have to use the tools that are all around you.
Do yourself a favour and incorporate mirror work into your daily routine.