SoulKeep - Amped Zapper Saved Me

I don't know how many days in a row I've been trying to level 3 of league 1 but at least I have a lot of great strategies after renting a lot of cards and also some spells I found what I was looking for and that's Amped Zapper and in fact this card has great capabilities and I know that in the fourth wave it's still very difficult but at least there is progress in that level and in Gate defending.

I used to start the second wave with at least 5 hearts missing because of the Fiends but the first time I passed the first wave without losing a single heart thanks to Amped Zapper and another time using only two towers I was able to pass it by losing one heart.

In fact, having features like Poison also helps a lot in curbing the Fiends and as for the towers that I use besides Amped Zapper I have Gloom Owl and also Charnel Pit and for Spell I use Cheapo and also Gear Grease.

The difficulty of the fourth wave at this level is that it attacks from three directions, and at the beginning of the turn it attacks from two directions at the same time, so I am thinking of using towers that have Blast because that will be very useful, and also with the presence of Gear Grease it helps in strengthening the towers a lot.

I see that I can rent SCAVO again because with the Amped Zapper tower next to the gate they will help a lot in confronting the waves of Fiends, but the confusing question remains for me, do I use them away from the gate to benefit from a larger range or next to the gate so that they attack together? In general, I will try.

Thank You and Wish Me Good Luck