Hi Dave, and welcome. I have a rubber boot liner in my vehicle and I think they are great. My wife carries a fair bit of grocery shopping in the boot and if anything spills then its an easy job to take out the liner and hose it down. Just one thing, I would recommend a liner with a raised edge or a lip on the edge so that anything liquid is contained by the liner. It's worth the little extra to buy one of these. There's not much worse than a boot carpet soaked with full-cream milk that has leaked out of a broken container.
The liners will vary in size according to whether you do/don't have the spare wheel option.
Edited by: plbxr