What Size/Type Great Day Overhead Gun Rack for Deere 2017 590i S4?

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It's a (surprise) birthday gift for good friend, brother in law and hunbting partner and vehicle is out of town - no way to measure myself... so hoping someone can help out... I like the Great Days because he wouldn't have to drill...

The Great Day overheads come in both front/rear and side by side mounts for their overhead 2 gun racks and they come in a variety of sizes...

Can someone help out with a size/type recommendation?

Also will the Great Day 'Power Ride' rear mount rack mount OK on the same XUV behind the rear seats?

Thanks!

QuickDraw Overhead Gun Racks | Great Day Inc.

The Power-Ride Carriers Gun & Bow | Great Day Inc.

 

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I tried contacting GreatDay last week but after several business no response yet...

I could go with a Big Sky rack as an alternative as it's a sliding 1-size-fits but it also requires drilling which I was hoping to avoid.

Anybody here have a GreatDay on their 590?