MacBook Air - External Display Help w/ Specifics

[DiamondDean]

Mac Gurus Unite and Help Me Please:

I'm a newbie to MacBook Air and have searched to no end for a solution to adding external displays:

Here we go:

MacBook Air - Mid 2012
HengeDock for MacBook Air
USB 3.0 Hub (4 ports)
23" Displays / Monitors - 3 (non-Mac) (Dell, HP, Samsung)

I dock my MacBook Air in the HengeDock.
I can run a USB cable from Mac Air / Dock to my USB 3.0 Hub
/or/
I can run thunderbolt / mini display from Mac Air / Dock to ???

What would be the specific parts ( ie: display adapters, cables, etc) and set up in order for me to accomplish:

Use of 3 external (non-mac) monitors - mirror mode (not extended across 3 monitors - but using 3 monitors independently for multiple windows, tasks, etc), while MacBook Air is docked (clamshell mode)?

Note: I tested the MacBook Air in HengeDock, clamshell. 1 external monitor and it worked

Now - how to get all 3 monitors live as described?

I've seen how to do it with thunderbolt displays, with lid open, with iPad as a monitor, and many other combos. Just not the way I'm going after.

I would greatly appreciate some detailed advice.