I have 5 mini lop x breeds. We have a 3x2 covered and paved enclosure and have attached the 3x2m low walk-in omelet outdoor run and am about to upgrade it to the tall version for the sake of my back. I have put paving slabs around the inside edges of the omlet with grass in the middle. This seems to have worked. I dug out a section of the grass in the middle and put some short ceramic pipes in which they love to zoom through. The pavers around the edge seems to have resolved any issues with digging.