No Prep Time
Setting East City
Android 15 got lolstomped by SSJ1 Vegeta and 14 got stomped by SSJ1 Trunks (who came out with only a bloodied forehead). Both of them were owning them at base and were able to fight evenly with base Goku.
Frieza and his dad seems to be more impressive, so they should take it with high difficulty.