That requires me to ask you how tall your fence is on your router table and how tall your work is?
For most of what I do on my router table my fence is to low for standing work up on end. About the only time that I did that, I had a taller fence and was using a lock miter bit. Even after getting the bit and fence set correctly for this, I wan't happy with the result, so I have been using splinned miter joints made on my table saw since then.
For work laid flat on the table I use my hands, if it's large enough to do this safely, or if the piece is small I use a Grripper with the narrow side of the Grripper removed, so it will pass over the router bit. I also have one of these for small work
http://www.rockler.com/rockler-smal...JC2NvF_CvqxOUJKz_MYhYQ4qRhKlzdOxoCeeQQAvD_BwE I also use this on my table saw. The vertical sled from Infinity is nice, but if I felt that I needed one, I would build something very similar from cabinet plywood. To me, plastic is too slippery for making a jig like this, except for maybe putting strips in the bottom so it slides on the table easily..
Charley