Can I use LATCH (UAS) anchors that are not designated for the vehicle seating position I've selected for Liing?

NO. LATCH (UAS) anchors have a required standard spacing of 11 in. (280 mm) from centre point to centre point. Liing is designed with a rigid LATCH (UAS) system and will only be able to connect to lower anchors designated for that vehicle seating position.