multidisplays

My old toshiba laptop has a 14.5 inch display that I mostly use for work. Adding two additional screens will really help things swap faster. What are my cheapest options as on August 2022? Is it a good idea to use cheap tablets instead of a tri-display setup? Pls help me with some ideas...

Here is the issue I am having View: https://www.youtube.com/watch?v=GjBRNKuCUWQ I rotated the monitor on the right 90 degrees but ever since I rotated the monitor they don't align properly. Monitor on the left is 4k (3840 x 2160) while on the right is 2k (3440 x 1440) On rearrange displays...