Looking to purchase a laptop for work multi-screen set up capability

So looking to purchase a laptop for work, will be used at home and when traveling. Nothing too in depth use wise, excel, google earth, various gis systems and database systems - I do usually need to have most of these open at the same time though.

Which leads to the only reason I am asking the question, I need a multi-screen set up. 3 screens at the office so that is what I would like to be available on the laptop when I need it.

I am looking at the following two options for the as of now.

LINK

LINK

leaning towards the second one.

So could I plug a tv or monitor into HDMI slot and use that plus the notebook screen simultaneously?

I was then looking into the 3rd screen option using this adapter LINK

would I be able to use a screen on that adapter + hdmi screen + notebook screen simultaneously?

Do the computers I am looking at have enough memory, a good enough graphics card, and enough graphics memory to perform the function?

Any other comments or suggestions? I am really just looking for guidance here as Best Buy guy originally told me mutli screen set up is not possible (is that true?)

ETA: I know multi-screen would be easier with desktop, but need to travel (only would use two screens during travel) and would like to have everything saved on one computer