i used mechanical fasteners to hold my tank in, just so i can remove it easily for maintenance. the original was unpainted/coated and foamed in. it lasted 30 years.
a lot of guys use coal tar epoxy to coat. i have never used or applied bedliner, so i don't know about it. it does very well on scruffed up steel. some even powdercoated, but i have heard of it cracking.
probably the best is to do what you think is best/ affordable, then seal the deck very well. i chose to leave my compartment open for air circulation. not sure if that is best, but i can always go back and seal and foam.
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