What graphics cards under multi-head for Linux

I had 3 “NVIDIA NVS 300 Dual-VGA” with 6 monitors. I switched to 2 “NVIDIA Quadro NVS 450” cards for 8 monitors.

NVS 300 worked well with Nouveau open drivers, with NVS 450 I have a complication and with Nouveau and closed drivers from Nvidia.
I’m looking for mutihead cards that will definitely work with Linux (preferably via Xrandr, without Xineram).