A lot of good ideas guys, many ThankX.
This piece is to be used as a top of a plant stand. I'm planning on using
an oak balluster for the single leg.
My roundover bit does have a roller bearing.
I was planning on rounding over both sides, but, doing just the top edge
will be OK.
I do have a router mat, but, forgot all about it.
I'll probably try either the pin(s) or the V angles methods.
I'll let you know how it works out.