how many bookmakers?

I started with surebets recently with the pro subscription. How many bookmakers do you think are needed? My bankrooll is around € 1500
For now I have William Hill, Bet365, Bwin, Betway, Unibet, Sportmarket, Asianodds, maybe they are too many? Which ones do you recommend to keep?

The more the better but bet 365, 1xbet are a must have

Actually you will do fine with just Bet365 and Unibet until you eventually get limited (which will happen).
If your bankroll is 1500€ deposit 500€ in each account but use staking/Kelly based on a 1500€ bankroll. If one of the accounts should dip then you have the 500€ reserve to top up.
You do not want to spread the bankroll over too many accounts.

I only use bet365 this moment which given quite lots bets. Lol