I have veggies growing in raised (2' high) beds surrounded by hard landscaping. I'm pretty sure I have voles living in the same beds (tell tale little holes regularly appear throughout the summer). A few of my carrots & beetroot are gnawed from below so I have to discard those vegetables. The beetroot are indeed gnawed so that just a shell of skin is left. I have a slight problem with slugs but I'm sure this damage is down to voles.
If I start losing an unacceptable percentage of produce I will have to resort to traps etc. but, for the moment, I'm accepting the odd loss.