Hi Robert
thanks for reaching out to us. Installing a hot mopp shwr pan is the most durable and typically is the most bullet proof way to obtain a water tight condition for a future shwr tile floor. However they must be done right and in the proper order to correctly flash everything in. We also highly recommend doing a mortar bed application in lieu of backer board for this application. Heres our recommendations:
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Make sure you have solid backing all the way around your shwr at the transition of hot mopp to wall board. This will ensure proper nailing and a good hold for everything. Hot mopp should go up the wall about 12" min.
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Do your hot mopp. Make sure your drains are properly placed and weep holes are sealed to prevent tar from blocking them.
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Then float your floor up to proper drain height, slope etc.
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Next you can install your wall system overlapping the top of the hot mopp by a min of 2-3 inches for nailing. Or down to the floor if using a backer board. Stay away from making penetrations in the hot mopp walls as much as possible.
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You can then start your tile application.
Hope this helps!