MatchTrader and TradeLocker are currently not supported, but it might something we can reconsider in the future. We'll let everyone know if anything changes.
In the meantime, we can recommend you look for prop firm supporting cTrader or DXtrade, as with Duplikium Trade Copier you can mix all MT4, MT5, cTrader, DXtrade, Tradovate, FXCM, LMAX, FIX API, Fortex(coming soon),...
Here is a list of prop firms supporting cTrader/DXtrade and still MT4/MT5, more information here (https://www.financemagnates.com/forex/prop-ageddon-is-your-prop-firm-still-online-real-time-updates/) :
Smart Prop Trader
FTMO
The Funded Trader
E8 Markets
Goat Funded Trader
Lark Funding
True Forex Funds