What would be the best option to make sure realtors will be paid in a wholesale transaction (listing or buying agents)?

Yeah, while buying subject to can definitely make sense, selling subject to is something I would never recommend unless there are no other options and even then, only to a reputable company with a long track record and good references.

I have sent him the three day notice by courier but he never acknowlege nor did he pick up my phone.What are my options now?

I know there are lots of web based tools, but those are pretty hard wired. 

One piece here is that yes you can potentially find buyers that will have a premium for successful track record + even furnishings, listings, review - but important to remember that there won't be a premium assessed by the lender in almost all situations if the buyer is using financing to acquire - their loan will be based on the pure real estate value even if they are paying more - just a tip to keep clarified so no surprises that can throw off deals

Most AI data modelers mostly use cloud-based data centers like mentioned above.

Ever since, I started to notice companies that were based in Ohio or had headquarters there.

There are a lot of options out there.

the police would be another option (non-emergency number).

Plenty of free options out there to learn the business and get your feet wet and start taking action.