1070 owners or similar setup, how did you wire your triple monitors + 4th monitor?

I have 3 Acer predator 27” monitors on a GT omega monitor stand. I have a 4th Asus 27” monitor with just a displayport that i want to utilize for FPS gaming.

If i’m using the 3 displayports on the 1070 already, what’s the convenient way to utilize my 4th monitor if i want to attain 144hz refresh rate? I only have HDMI and DVI port available.
 
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