On mine, I made a wood base and made a frame with 1x2's or 2x4's to go around the bottom edge of the tombstone. I put screws through the backside that went through the tombstone and into the front wood frames, screwed the sides to the front and back, basically creating a slot for the tombstone to fit in and was secure. I then screwed the framework to the wood base. Making sure everyone was bottom heavy was key. On a few of them, I drilled a hole through the base and used gutter nails to push down through it into the ground. Haven't had any blow away this year and we've had some hellacious winds!