For deadlifts I’ve seen someone here use the safety bars as the ‘top’ of the rack for the bands. He placed the bars at the desired height that for the band tension and used that set-up. I know that sounds abstract, but it is hard to explain without a picture. I’m sure the same could be used for squats.
For squats you could take the safety bars from another half rack and have two pairs; one for the bands, the other for actual safety.
I hope that this helps.
Ryno