Unfortunately, unlike in the US/OZ, not many over here in the UK seem to use transom savers at all.
On our 5m/60hp rib, which is generally only towed a few hundred metres, then just utilise the tilt lock lever. For longer distances then we lower the motor onto a h/w timber block trapped between saddle and leg to take the strain off the hydraulic tilt.
On our tiny 3.4/20hp rib, which regularly does 400+ mile road trips, we cobbled together a diy rigid transom saver. No power trim/tilt on our 20 and wouldn’t tow raised only on the flimsy tilt lock mechanisms.
Despite the manufacturer’s disclaimer I would have no qualms using the Attwood saver on a small manual tilt motor.