Can't help you much with the mounting plate questions.
Will Ditto what BJ said about stores being 'proud' of those plastic knobs.
And his system for shop made ones is a good one.
If you do decide to buy ready made --
Watch for a sale at Rockler or Woodcraft.
Rockler frequently has a kit of T-track, knobs and bolts all for $10.
Word of warning - something I learned the hard way --
Not all knobs bolts and tracks and tracks are the same.
The bolts that are made to go in the blue T-track sold by Rockler are too large for knobs and T-track made by Incra.
By the same token -- the bolts made for the Incra knobs and track are too thin for the Rockler knobs.
There is no one right answer -- but one handy thing about Incra -- their stuff is all made around standard 1/4" hexhead bolts --
Just some words of wisdom gained through personal errors -
Your mileage may vary --
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