Hello. I got some problem on my server: Sometimes (after reconnect to server) players appears few blocks under their last place they were stand and get stucked in a blocks then died and loose all items. I don't know why that happened because, but I need some plugin that can guarantee exact respawn (exactly for vertical distantce). Thanks you.
Disable suffocation damage using Essentials. Your users will no longer die from being stuck in blocks. Alternatively, I think there is a plugin which already does this...