Touchstone sells four SRV lifts. Two hold the TV straight; the 32820 and 33920 add a 360 degree swivel. Both the comparison chart and the product pages put the swivel models at 120 lb against 170 lb for the fixed ones.
Every SRV product page says the lift is not designed for drop-down use, so these are pop-up lifts only.
The chart's maximum TV height assumes nothing sits below the TV. Touchstone's footnote says the limit drops once a component shelf is attached or gear is placed under the screen.
One figure is held back: the chart prints a raised height of 16 in for the 32820, which is lower than its 28 in lowered height. The product page says 56 in. Until Touchstone fixes one of them, the raised height shows as not confirmed.
Install any lift by the maker's manual linked from its product page. Anchor points and supporting structure are covered there; this site does not give installation advice.