So far as I am aware, the Atlas will not fit on the bare EdgeHD 14 without hitting the focus knob and the mirror lock knobs. Neither will the PDF. It should clear them OK with the Celestron FR in place because the FR comes first.
Nice thing about the Celestron FR is that it does not consume any backfocus, so with it in place, you have the same backfocus distance as you did without it in place.
The Celestron FR for the EdgeHD 14 is certainly not elusive. I have one here. It only took a little over a week to get from order to delivery. Haven't had a chance to try it out yet though.
The Optec TCF-Si fits the scope without bumping into anything, but it consumes 3.5-inches of backfocus plus another 0.1-inch for the rear opening adapter. That doesn't leave much room for anything else.
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