Do you know a DEX with 50+ slippage & Ropsten/Kovan network?

Hey!

I'm trying to find a DEX website that I can increase the slippage to 50+ (not like Uniswap for example) on Ropsten or Kovan network.

I already find Dodoex, but I can't import my contract and I don't understand why.

Thank you for your help!