Earnest money norms

Question for the community on earnest money norms in sub-$1.5M trades acquisitions. I'm in late-stage LOI negotiations on a commercial trades business. The financing structure is still being worked out and could land as either SBA 7(a) with a partial seller note or 100% seller-financed. The counter I received included non-refundable earnest money due at APA execution, which felt aggressive. Want to ground my response in market practice rather than my own read. A few specific questions: What's a typical earnest money amount for a sub-$1.5M trades acquisition? Flat dollar amount or percentage of purchase price? When is earnest money standardly due? LOI signing, APA execution, or DD waiver? What refundability terms have you seen as market standard? Refundable during DD for any reason, non-refundable after DD waiver, specific carveouts for seller breaches or material misrepresentations? Does financing structure change earnest money norms? Specifically, do you see different practices between SBA-financed and 100% seller-financed deals? Sellers in seller-financed structures may want more skin in the game upfront, but curious whether that's actually market. Who typically holds escrow? Title company, escrow agent, attorney trust account? Appreciate any guidance from those who have closed deals or seen recent comps.