Ideally you will sit dead center for excellent imaging.
You want your drivers, especially the tweeters at seated ear level. That often means IN the bookcase, perhaps horizontally, not on top. In either case, no rear ports.
bookshelf size benefit from a sub to add just enough so they don't sound small. adjust so unaware of the sub unless you turn it off.
my small office with wharfedale diamond 225's and an in-expensive sub is posted here, pics 12, 13, 14
https://systems.audiogon.com/systems/9511
You want your drivers, especially the tweeters at seated ear level. That often means IN the bookcase, perhaps horizontally, not on top. In either case, no rear ports.
bookshelf size benefit from a sub to add just enough so they don't sound small. adjust so unaware of the sub unless you turn it off.
my small office with wharfedale diamond 225's and an in-expensive sub is posted here, pics 12, 13, 14
https://systems.audiogon.com/systems/9511