This video highlights 2 important installation tips for a rear-facing convertible seat installed with LATCH:
On a rear-facing convertible seat, use your stomach to 1. push the car seat into the back of the vehicle seat and 2. sway the car seat side to side – WHILE you pull the LATCH belt tight
While the seat shown in this video is a Graco My Ride 65, the techniques apply to most rear-facing convertible seats (see the above blog post on inside vs outside for a list of seats that are the exceptions to the “inside” rule)