Zenview is pricey ($75); but UltraMon is really not bad - especially considering that for the $39.95 license you can use it on all of your computers ==> they have a VERY generous license ["... a license is required for each machine on which the software is installed, or for each person who is using the software, whichever requires less licenses. If the software is purchased for personal use: family members living in the same household can also use the software ..."]
UltraMon is also far-and-away the best utility of its kind => the "Move to Monitor", "Maximize to Desktop", and "Smart" taskbars are my favorites features ... they make it REALLY nice to work with multiple displays [I have two monitors on one system and three on another].