Safe House? Teach me?!

There are three of us, and on two different occasions today we have been raided through two metal doors and lost 15+ AR’s with other miscellanious items. What are your guys ideas on building a safe, inpenetrable house for 3 people? Youtube videos are welcome! Thank you!

very high base (13+ stories), 10+ doors to the lootroom, with lots of foundations around the outside

You just need more doors and walls.
2 metal doors only takes 4 C4.