If you are happy with the performance, I have some similar Cat systems, and I do use a TripleHead2Go and works fine for us. Richard will tell that will definitly comprimise performance. We work fine with them.
If I was on your shoes, I will go ahead and get a DualHead2Go (less performance consumption), and pretty cheap, arround 150 - 200 bucks.
Put in the second output, goes to DL1s. and the 1st Output goes to the other projector.