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I think the battens were suggested to prevent the board flexing, not for transport. If it flexes it doesn't matter what adhesive you've used, the tiles will come off. And if it's super heavy then it's likely to flex if ever moved. A sub frame would be a good idea. No idea on adhesive though I'm afraid.
I'm pretty sure it'll stick (with standard tile adhesive), but if it's needing to be transported and flexes ... just screw battens to the back