As long as it doesn’t block any fans or the mobo (or anything attached to that), you may be ok. Just make sure that the cables are in the SSD good to prevent the SSD from falling out.
Just get a double sided foam sticker, and stick your drive on the case, dangling, drive can and may disconnect power or sata at the worst time possible and loose/damage drive.
and your cables are not long enough to lay it flat on the other drive ?
in the backplate of case there are LOT of cables and its a big mess , but nothing will happen if I leave it like this?? I mean the cables arent put to a lot of stress or anything.