I'm definetely not an expert in arbitrage betting, but I think safest arb bet is when you bet in a match before hand and then with another bookies that offer in-play betting, you arb your bet as the match goes and lock yourself in for a profit. But of course there is lots of condition in order for that to happen.
e.g Via Betting exchange,
or arb in a situation where there is only 2 possible outcome or bet is voided, eg ODI Cricket.
Sorry if its a bit OOT and not answering what you really asked but slapdash already answer all your questions I guess
and good luck with your arbitrage betting. Would also be nice if you are starting to get the hang of it and make a new thread for yourself sharing your arb system to the PL Community
