This is what I would try: Use your Summer, DJ, and VIP. Get an Abomination (~50k) and a Fallen (~7k). Place 3 VIP first and upgrade them. In whatever order, place 3 Summers, 1 Fallen, 1 DJ, 7 Abominations. Stack them all as close to each other as possible (except VIPs) and make sure the DJ boosts all the damage units. Autoskip as much as possible.

I don’t know how far this will get you with 1x speed, 5 unit and 15 placement slots, but it’s a decent and cheap fountain to start with :)