Ok as promised I installed my RO/DI unit tonight from AquaFX, and I took some pics to show fellow RC'ers how easy it was to install an RO/DI unit to an existing laundry room setup!
Ok so first here is the official unit ontop of my washing machine. Specs for it can be found
HERE
Ok so the first step was to purchase a Y connection in order to be able to quickly turn the RO/DI unit on without having to change hoses manually. This brass connector cost about 5 bucks. There are also plastic type Y connectors for half the price, but since the water tap is ALWAYS ON I wouldn't put my flood insurance on the line to save a couple bucks. Make sure it has o-rings in it or your gonna have leaks all over.
Ok the next step was to buy some high quality wall anchors suitable for heavy weight since the RO/DI unit fills with water and becomes fairly heavy. I purchased these guys here which are rated for up to 75 pounds. They are made of metal and rotate sideways when the screw is inserted and sit flat against the back side of the drywall. Another type of anchor to use would be like a butterfly anchor. I wouldn't recommend a straight plastic anchor that doesn't clamp onto the wall.
Next I marked the wall where the anchor should go. Something that I did that I would recommend is make sure that one scew lands on a stud. Stud's are typically 16" on center, so if you have a stud finder you should be able to find a convenient stud to use for one of the two screws. If not, 2 wall anchors will work fine. Then I drilled in the anchor and then drilled the screw into the anchor.
Next I ran my drain line from the RO/DI unit which gets rid of the waste water. At this point some people choose to re-use their drain water in various things (watering plants), but I have no use for it so down the pipe it goes. ALL washing machines have a drain pipe, so if you can't see yours at first....... look harder, its there.
YAY! Im all done. The feed line is on the right, the RO/DI water for my aquarium comes out of the left.
Ok honestly it took me longer to resize these images and type up this experience. It's really really simple and anyone should be able to do it. I kinda cheated and used a drill to put my anchors in just cause im lazy

but it's easy enough with a screw driver too.
Like always any questions are welcome just lemme know!