@Elwood - Welcome to the forum my friend! The Hoher Flexrack can go very high. You might be able to adjust that one so you’re looking up instead of down. You are correct in looking down will cause saliva to go into your mouth.
If you wanna try the Harp Lock or the Rackit2.0 with a stand mount, the key is to bolt a round based stand to a piece of plywood that you stand on to give the stand stability so that it doesn’t run away from you. That’s the key hack I believe. I haven’t tried it, but I saw Peter Madcat Ruth do it on his video on the Rackit2.0 page of the Blows Me Away website. Links to all that stuff here: