Axiom DLX Streamliner Disc Cycle Rack, Black https://www.amazon.com/dp/B004094HY2?ref=yo_pop_ma_swf
I was able to mount this rack to my cyclocross bike which also doesn’t have any mounting eyelets on it. It worked perfect for me by putting the quick release skewer through the lower mounting points.
And then for the upper mounting points, there are two different options it comes with. Two adjustable arms for bikes that have the normal threaded eyelets on the frame behind the seat. Or a metal arm that bolts to the mounting point for normal brakes.
If you want to use the two adjustable arm option, you can buy a seat clamp that has threaded mounting points in it. Here’s that.
Axiom Trekk Seat Collar w/Rack Eyelets, 31.8mm https://www.amazon.com/dp/B0025UQ3I6?ref=yo_pop_ma_swf
Here are some photos of my bike with both the rack and the threaded seat clamp.