Over-Molded Threaded Plugs
If the surface you're masking off is having issues with plugs blowing out and it involves a threaded hole, you can't go wrong with an over-molded threaded plug.
This is a great option as it would take an immense amount of pressure for these to blow out. You're also able to tighten the plug as needed, so ensure you have an effective seal.
The drawbacks of this option will be the amount of time needed to install and remove them. They will also be slightly more expensive than the other all silicone options due to the addition of a metal bolt.