This tarp tent is supported at center by one aluminum pole underneath or an overhead line, plus five stakes at the corners. Has room for three plus packs and a bicycle or two, but can take a while to setup, has no floor, and offers less mosquito protection than enclosed tents. Otherwise it's great. This allows complete flexibility of attachment points and is much stronger than grommets, which pull out. This technique is also useful for stabilizing and quieting any tent buffeted by winds.
Poles are fiberglass, which is strong and flexible, but twice as heavy as aluminum.
The fly should extend at least half-way down the tent walls. Check the stitching before leaving the store. An old three-pole cheapie worked fine on my first tour from Scotland to Greece, and was easy to sell for 2000 drachma when it become superfluous due to perfect weather. Surrounds your sleeping bag to repel weather. Usually made with a coated nylon bottom and a GoreTex or otherwise breathable top.