You don't need anything like that with a mid ride UBL. You need it with low ride UBL. You don't need low ride UBL unless you are a midget, run a pistol that is longer than a Glock 34, or run an ALS/SLS combo holster.
None of these aftermarket gizmos make a low UBL rotate at the hip joint. It's a fixed plate. That is the problem. Just get a single drop strap 6004 attachment if you NEED a lower mount and quit half assing it with a low UBL. It is actually going to bend right under the belt that way.