How can I place 4 orders in Bitmex with x2 leverage each that compount when the price increase by 25% 
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As far as I can tell, with Bitmex, you can place one order (limit order) at a time. The next limit order you place will be merged with the current one. ? Now, say you know for sure BTC will go up in a month, or so. You place your "limit-buy/long" order and wait. The leverage you choose will give you breathing space, in case the price temporarily goes down. The higher the leverage, the less breathing room you have.
A leverage of 2x will give you a lot of margin (breathing space). Bitmex indicates the liquidation price, which changes with your chosen leverage. You can check this.
The downside of only 2x leverage is that you won't earn as much as you could with a higher leverage (given your insider info, you may want to go higher with the leverage).
