Cleanse/QSS should work with Tahm W
Mikaels gives you slow immunity, while Phase Rush is a brief slow resistance buff.
If you use Cleanse/QSS you invest a summoner spell(that could go into Ignite/Exhaust/TP) or 1300 gold on an item that you don't build on Tahm normally so you are not a fat-lazy catfish that can't move while devouring a champion.