Trouble securing anubias plants

I have the petite & the short & sharp anubias & can't get either one to stay down.

The petite is really difficult because it's so small.

First I tried thread & tied each to a piece of drift wood.

Then thread & silicone tied to rocks.

Then fishing line & some sort of aquarium putty tied to rocks.

One problem is the nerite snails - I think they are pretty rough on thread.

The rhizomes are so small & I'm afraid of breaking leaves off.

Is there another glue I can try?

If I knew a surgeon I'd have them come over and tie the knots for me!