Yes you would leave about a 1" gap, between it. I don't know how much more sturdy it will get with that plate on there, Its not really supposed to help out with supporting the bumper, however I guess any little bit helps.
Took mine apart and found out exactly what the problem is...
There is a notch next to the seal that doesn’t have a notch cut out on the cover.
The clips actually fit fine and will lock in place if you go on an angle. Here are the pics for reference