Picked up this stem bag for my MTBs fits best out front. Not sure if I like it though.
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I use mine on the side. It seems like it shouldn't work, but in practice, you rarely squeeze it. They usually (I have a Jandd and Revelate) turn out of the way if they come close to squeezing. I think I routed my dropper cable housing through one of the webbing straps to keep it from binding the bag.
Ofc if you have the bite valve open, you'll get squirted in the face. I like the push/pull valves better there, since you can snack it closed easily. The camelback bottles I generally like more, but they tended to squirt on any sudden impacts. Not the worst, but I usually switch to them in the winter, and I don't need to be wet when it's 35 degrees.