An ideal capture laptop is the Dell M6800, with the IPS display.
But you must pay attention to OS (Win7 installed), to specs (ideal combo of CPU, RAM, graphics, etc, for a capture system), and to how well it has aged. Some had OS downgrade rights, so 8/10 can be uninstalled, and the ISO acquired from Dell (not a random place, must use the Dell copy). The drivers must be updated, USB3 has issues otherwise. Some features like Bluetooth and webcam actually make it worse, so best avoided, unless disabled in BIOS and OS.
Boot from the mSATA SSD, large HDDs. Large = SMR, so quality matters.
SSD fragmentation makes those not great for large captures, drops and corruption.
Some of the IPS have burn-in, hotspot, or splotch damage, and cannot be used. Most cheap eBay
units have this problem, poorly taken care of. Like certain JVC VCRs, the laptops were beat to hell by their commercial user base, so you must be very careful to find one that was taken care of.
Calibration can also be tricky, it depends on the unit, and how the screen has aged. Some are easy, some are impossible.
I have a contact for factory refurbs, and have acquired and upgraded into amazing capture machines for some members here. Fully setup for the capture card, ready to go. I quit offering system builds on the marketplace long ago, but I still get requests for it, and I make time to do it.
What you don't want is a random laptop, especially not with shiny/reflective screens that are impossible to calibrate.