I’ve documented my struggles with Widgets on macOS elsewhere, but to summarize: love the idea, hate the placement restrictions.
I have two 27" monitors, and use the Calendar, Stocks, Clocks, and Weather widgets. I have lots of other windows open semi-permanently, but I’ve left the lower-left corner of the left hand monitor, and the upper-right corner of the right hand monitor available for these widgets. However, due to placement restrictions (which vary from one release of Sonoma to another) the widgets are 1) completely hidden, 2) completely visible, or (currently, on 14.1.2) partially visible. Widget placement (at least for the monitor arrangement I have) definitely needs work.
[Edit: These issues may have been caused by a corrupt preferences file. See my latest post in the above-referenced thread.]