I'll have to make sure I plant them far enough apart. I've had problems arising from plants competing with one another from root systems too close together and had to transplant them. I'm trying a large box about roughly four feet by 1½ feet wide by 1½ feet deep. From the picture you posted it looks like the rosemary gets kind of large.
Resiliency is important for me since I'm not a seasoned gardener and there are plants out there that do not like the scorching hot, jungly Florida conditions.
First, don't worry about not being a seasoned gardener - you're growing herbs, so that counts - seriously, to me, the best thing about gardening is that it's low stress, simple, it's plants and dirt you can't screw it up. If it doesn't work out, plant something else or try again. Don't stress over it.
Thyme does look good in the front of a large pot/box as it has some what of a low growing cascading habit. I'll get a pic of mine when I get home.
The rosemary I have has been trained into a shrub form, I bought it that way. The smaller plants/sprigs that are available would take quite a while to reach the size of the one I have.