Start on the individual product page, as mounting requirements vary by product. Scroll down past the Add to Cart button and the Product Details section, then expand the Specifications drop-down. Scroll down to the Dimensions by Configuration chart and look for the Required Mounting Space column that aligns with the lift style or feature you are interested in.
To compare mounting requirements across similar products, you can also check the How To Measure page for the product category you're looking for.