How many holes did you have... counted 10 plugs. Might have been easier to cut a big circle and retrofit some holes.
and apply a Box Guy Clamp.
Love those BGCs... made a couple myself.
and I didn't have the skills to get a IKEA edge finish!
The secret is to forget the "package included" allen key
and go for a "pivot head" stainless
for that true IKEA masterpiece
If your first cut is too short... Take the second cut from the longer end... LBD