aqua safe ro/di unit instalation help

[scuglass]

ok so i am trying to hook up my new ro unit(maximus with the tank). i want to put the unit in my furnace foom and there is no sink in there but a bunch of water lines. can i just tap into one of those (ex. the one going to the water sofener, or coming out of the water sofener(which one of these would be better?)) and then just allow the waste water to flow down a drain on the floor rather than hooking it up to the black piping that is under a sink??

also can u guys show me pictures of ur setups with autotop ups and such

thanks scott