How to structure private 2nd lien behind hard money 1st

I have a couple investors interested in making initial investments with my RE biz. I'm looking to structure their investments in the 2nd lien position behind the hard money 1st position. Will this pose a problem with the hard money lender since they want my "skin in the game"? The hard money lender doesn't require proof of funds and therefore wouldn't know where my funds are coming from but in recording the 1st and 2nd mortgage, can this be done without the hard money lender knowing?