Acrylic bathtub install question

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Preparing to install a Kohler Archer alcove tub on concrete slab for mother in law. She has spent a bit too much time reading reviews for acrylic tubs and is concerned about cracking.

I understand the idea of placing tub in a bed of mortar and manufacturer calls for this in addition to securing flange to studs. I am wondering if having it anchored to the floor and the wall framing is more likely to cause cracking due to differential movement? Any thoughts or tips on installing this or similar type bathtub?

Was considering adding a ledger with a little clearance between the board and the tub & either adding a small amount of mortar or thinset to the ledge of the ledger (or a thick foam weatherstripping piece) to allow the tub to settle into the base mortar and the rim set into the ledger instead of screwing the flange into the studs. Seem like overkill? or would it possibly allow more movement potential and reduce cracking potential?

Just thoughts in case you have your own to add...
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