You can hold ETH spot as collateral for perp trading, or if you want to do it delta neutral: ETH/stETH as collateral on spot and short ETH on the perp side, something I really miss on DEXes today as this is way more capital efficient than holding 60-70% of the capital on the spot side and 30-40% on the perp side. As far as I know this is not possible on other DEXes today.(Route 2 FI)