ATC Brokers
I can also confirm that they close margin calls the same as GP, largest loss closes first. Your also going to have access to a free Beeks VPS hardwired to the broker's server. I have no affiliation with ATC or Beeks other than being a client.
quoting from their website,
Do you follow the FIFO rule?
In order to abide by the CFTC FIFO rule, the counter party offsets the positions on a First In First Out basis. On the Empty4 4 platform you have the ability to close the positions as you see fit. For example, if you buy a contract and buy another contract at a later time and you decide to close your most recent buy position, you can simply close this position on the Empty4 interface, however, the order that is sent to the counter party will be offset with the FIFO rule in place. Your net position remains the same on the Empty4 and the back office. For the Trading Station II platform, FIFO is applied only to US accounts.
(Apologies Tredinator) 
