I have two APC Smart-UPS 1000VA 2U rackmount backup systems for my two 2-post 19" racks at home. I come to find out that I need a $100 kit from APC to mount these 60lb units in my 2-post rack. Do I really need that kit or is there some other way I can safely mount these APC backups? i don't want to drop $200 on just being able to rack these UPSs. What should I do?