Lots of quality lower 1/3 height mounts out there. I have a Geissele and Daniel Defense mounts. Have also used Midwest Industries. All are good. Just depends on whether you want a QD type mount or not.

They make some taller ones these days but any higher than lower 1/3 and your existing iron sights won’t work. You’ll have to buy some offset ones if you want to keep irons sights.