Rek'sai

After some play time with Rek'sai i noticed her tunnels kind of suck. The enemy almost always finds them because there's no where to really put them and they can't stealth like wards. So I think what riot should do is reduce the number of tunnels you can place to say 4-6 and make them invincible and only last for 5-8 minutes or the tunnels should be able to go stealth like wards requiring red trinket or true sight for counter play against her. The tunnels are a necessity for Rek'sai's ult and ganking, with out the tunnels her ult is pretty much useless(besides the attack speed), which is why they shouldn't be destroyed so fast.