I agree, one should always have a contingency plan.This is the reason you should not keep all of your money in a broker's account. Only deposit the required margin and keep your investment at some place else.
I'm not particularly good at dividing my attention between several accounts, so I don't think I could work with more than two.
The problem is, when I see a signal for an entry point I want to use it for all my accounts - well, my two accounts. I can juggle manually with two, but with three or more my reaction time gets a lot worse.Two are good, three are fine also. You can trade in every broker one by one. One trade on 1st broker, 2nd in 2nd and so on. Its not that difficult to manage your accounts in several brokers once you get going.
Managed multiple account in different broker also as diverisify capital, I think still good if we open one account in different broker and trade all account, I ever read certain trader he managed account more than ten account and he was have capable to managed all.
In order to my trading experience, my first and foremost advice is to choose a right broker. Because the broker can affects the result of our trading. There are almost thousands online broker in retail Fore market. So, it is very much difficult to choose a right broker from all, as most of them are found to be scam. We the traders first of all have to choose in regulated trading broker which guarantee their clients funds. only regulated trading broker make sure security of funds with certainly including real trading facilities.