where can I put my twins to sleep in??

I literally have such a small room and to top it off when we moved in we bought a king size bed so I was so set on letting my twins sleep in their room until they were actually here.... they are 18 months and still sleep in their crib together that we squished in our room.

In their crib we did a diy separator so they eat have their own sides & I didn’t have a problem until recently one of my twins likes to hop over in the middle of the night or early in the mornings and steps/jumps on his brother!! Which is a big no for me, I ruse to let them sleep in their room because they both still wake up at night and I don’t want to be back and forth.

So does anyone know of another alternative ??? I only have 58x32 of sleeping space for them...

And I won’t allow them to sleep with us because my husband is an extremely heavy sleeper, he would lay on them and never notice plus I don’t want them to get used to sleeping on our bed. Sleeping in our room is fine but not in bed.