Re: tall stand for sierra lx?
These go to 45" and are rated up to 130lbs, so Sierras definitely won't be too heavy:
https://www.monoprice.com/product?p_id=625870
They also make ones that clamp onto the desk:
https://www.monoprice.com/product?p_id=600024
Never used them myself but monoprice stuff is usually pretty solid, if perhaps not the most aesthetic.
HT1: Titan Horizon V2, 4x S1V2, and Rythmik E15HP2 & L22
HT2: S-2EXs and Duo V2 C&S, and Rhythmik L12
Study: Sierra-LXs. Office: Sierra-1s. Kitchen: HTM-200s.
Brother owns CMT-340s and dad has a pair of CBM-170s.