interesting question...I can see where the plants can get very leggy and lay over.

Mine doing same and I tied them up just a few days ago. I took some wooden stakes about 4' long and drove them into the ground on either side of the plant and then tied the low branches to the stake. I will untie them once I harvest.

RM

Some tips can be pinched off on some of the more vigorous shoots and that will start more laterals going.
Here's a link to an earlier post with a similar subject. Brady

Here is a link that might be useful: When to stop pinching new growth on Blueberry Plants