if you use 2 EAs on one account, make sure the EAs use different 'magic numbers'.
You can commit a SELL order while a BUY position is still open if your broker allows hedging. US brokers don't allow it due to the FIFO rules.
Of course 2 orders of 1 lot each would sum up to 2 lots, that also means double risk and double spreads.
If you want to use 2 EAs, I'd recommend to use them on 2 different accounts, in order to be sure that the EAs don't come into conflict with each other and don't screw up each other's money and risk management.
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