Squatting 2x a week is plenty.
Depending on your goals this will dictate exercise order,
Quads = FS
Hammys = rdls
You can always switch it up after 8-10 week cycle.
You can do both in a single session but the first exercise will be priority and get th extra edge. Your body will be fine with both unless you do something like 10x10 for FS your Hammys will be ok for rdls. It's a training stimulus your body will adapt to it.
What does your leg routine look like? Mine is just
Wed: FS, Sn Sn pulls from blocks
Sun: bs, cj, Cn pulls
Mon: Sn deficit pulls