One of the main problems I've encountered over my numerous years in the biz, is to find a cab positioned with its back and one side wall positioned into the corner of a room.

Yes it looks "tidy" but it makes rear access impossible and therefore compounds cabling problems.

The other problem is from British Telecom's favoured trick of mounting ISDN and other LTE gear onto the wall behind a cab and then stringing their cables directly into the back of the cab. I've even proposed once ot BT that I'd give them a cab with a wooden board mouned into it to accomodate their gear, which they refused saying that "it wasn't professional", and then they came in and tried to wall mount their gear.