Best nvme board and drives to use as boot / l2arc?

Hey, is there a recommended best NVMEPCIE card. With two or four slots? I would like to use one. as boot to maybe raid two drives together and the other for the L 2 arc

It’s gonna be going in an epic or thread Ripper. system haven’t decided the motherboard yet.

Unless there’s a better recommendation for L2 arc and boot? I know usually I boot from two ssds, but I don’t know, figured and VME is a little cleaner, less cables. and probably more reliable. I’ve had some ssds fail. I even had the boot drive in my 45 drives. work server fail. but it was redundant, so it was fine.