I have a 13" MacBook Pro (see specs). Like all (I assume), it dual thunderbolt ports and HDMI out. Is it possible to screen span with two external monitors. If so, are there any requirements to how they must be connected- i.e. both thunderbolt, or 1 thunderbolt, 1 HDMI. I'm not going to be buying thunderbolt displays, so I'm not concerned with daisy chaining. Thanks!