I just had to upgrade my laptop because I had my backup laptop fail after using it for only a few months. I have had that backup laptop for years it just never got much use. My primary failed last October which forced me to use the backup.
That is a long story but I figured it was finally time to buy a new laptop. I have had pretty crappy service from HP and Dell laptops so I went with Asus. My previous Asus ran for over 10 years trouble free and my wife's did the same.
You might want to look at this build as it should run FSX just fine (MSFS2020 also). My old Asus ROG G72-GX ran it pretty well. I have not tried it yet with FSX although I did get it installed.
ASUS TUF Gaming F17 Gaming Laptop,
17.3" 144Hz Full HD IPS-Type,
Intel Core i7-11800H Processor,
GeForce RTX 3060,
16GB DDR4,
1TB PCIe SSD,
Gigabit Wi-Fi 6,
Windows 10 Home
It was on sale a few weeks ago for $1,399.99
https://www.newegg.com/tx-eclipse-gray-asus-tuf-gaming-f17-tuf706hm-es76/p/N82E16834235961
I then had to purchase the Windows 10 pro upgrade for $99.
Finally the RAM needed to be upgraded. I wanted a minimum of 32 GB and they only had that with a smaller SSD.
https://www.newegg.com/corsair-32gb-260-pin-ddr4-so-dimm/p/N82E16820236681
I added to this laptop an extra SSD that I had purchased last year for my new Gaming PC build. That build got derailed by unexpected personal expenses. This drive will be the FS drive on the laptop.
https://www.newegg.com/western-digital-black-sn750-nvme-2tb/p/N82E16820250114
All totaled I have just less than $2,000 invested in it.
The core purchase now @ $1,499.99 if it fits your budget should easily replace your current desktop.
There is a single HDMI port for your second monitor and if you want 2 monitors you would need to purchase a docking station to connect to the Thunderbolt port. Then you could have 2 monitors and the laptop screen connected just fine.
I still hope to build my gaming PC this year.