BTW Toilet Installation

I'm curious what is the recommended technique for installing a BTW toilet is? Mortar bed or Silicon? This particular toilet suite is porcelain cistern and bottom. The based doesn't have too much to attach to the floor other than bottom porcelain mold of the P part of the S trap. It has a PVC molding that sits on the P to direct it down (as an S). It also has a threaded rod with a plate that needs to be attached to the wall which holds the PVC molding over the waste, so the porcelain base...

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