@KenM10759 and
@lovinthehd are you both feeling ok?? KEF center with MS bookshelves??
McLovin at least suggested same vendor center, though probably it would not match existing speakers well.
Dear op, forget about low profile. If you need to look for is MS Alumni 5 center. It's the only one which will match your speakers well.
If need to wall mount it - maybe get a shelf