@maffsie I like putting it on the side of the screen so it wastes less "valuable" space. You can also scale it up and if it still exists, adjust/disable the zoom effect.
@maffsie also the "bounce" effect apps can use to get your attention will work even while the dock is hidden, but I don't think you can make Slack do that (and it'd be a bit annoying)
@noiob i hate having wasted space on either side of it + i don't like the "floating", which takes up more space. i'd rather just have something akin to the menubar that occupies a solid area of the screen. i'd simply have the dock hidden, but i often don't see notifications so being able to glance over to app icons to see if someone's messaging me on slack is important :(