The idea that the tape gave me was to use fusible web. I tried it tonight and it worked good.
I did the first parts the same... lay out the corner of the quilt and border, make sure it's all square, then fold under the top border and iron the 45 degree angle. I sprayed a TINY bit of starch on it to make that folded edge sharp.
Turn the ironed edge back and place fusible underneath it away from the seam allowance and iron it on
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remove the paper, lay the top border down and press to fuse. I pinned it for security
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I don't think I can get a miter any more perfect than this
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