Wouldn’t go over 0.01 lot on a $1000 account.
I would place a few EA portfolios (of different currency pairs) on a demo account first and see which individual EAs would perform the best (select winners and pause other underperforming EAs).
Could diversify in instrument selection as below:
2 x EUR/USD
2 x USD/JPY
2 x EUR/JPY
or ONE OF EACH
Works for me :)