I can see them to 30-40 yards a lot of times. Move them around the target. Also use them to pin paper targets on while I'm making tuning adjustments and recording where different arrows impact.
Might not be ideal for shooting indoors at 10 yards but they work well for me at 20 and beyond. I was just trying to give you an idea instead of glueing anything to your golf tees. Also if you hit the plastic the arrow usually just goes through it. Golf tees I'd imagine you push the tee straight thru the target.