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I don't do it as I keep tubes in a framebag or saddlebag but if I did I'd like stick it on the seattube behind the seatstays and wrap the tube in a ziplock before taping it to the frame. I'd remove/replace each event too to reduce chance of it being fucked when needed.
Another option that might work depending on how your knees track (not so good for me) is in front of the seatpost, taped around the top tube. Slightly more protected from back wheel muck.
Anyone got any tips on fixing a spare tube to your frame for long events? I’ve seen people tape or strap them behind the seat tube/ seat stay area? Does this actually work or does the tube get wrecked and people just do it to look enduro?