How often do these go on a RRS TDV6 MY2009. I have the tiniest of driveline vibration somewhere between 1600-1800 rpm on very gentle acceleration. Vibration is most pronounced accelerating gently up a slope, especially round an uphill bend.

Mm... this might be the early signs of the center bearing going on your rear propshaft. It eases as the speed increases, and is most obvious when accelerating up hill from a low speed.

It's not expensive or difficult to fix.

Brand new propshaft already fitted. Vibrations greatly reduced, but not totally eliminated

I'm not sure if failing engine mounts would cause what you describe. More likely to cause a clunk, as you come on or off the power. (But I've not had problems with the ones on the RRS, so I can't be certain, but that's what they did in other cars.)

How many miles has it done, as the torque converter could be causing it. When I had a full gearbox flush, it cured a slight driveline vibration on mine a year or two back.