/tmp should be mounted as a separate filesystem with the noexec,nosuid options set

Solution;

Under VPS edit /etc/fstab,

nano /etc/fstab

and insert below lines,

mount /dev/loop0 -o noexec,nosuid,rw /dev/tmpFS /tmp
mount /dev/loop0 /dev/tmpFS -o noexec,nosuid,rw

Now run command below,
mount -obind,nosuid,noexec,nodev,rw /usr/tmp /tmp
You /tmp is mounted now with noexec