It must be made clear that "embedded" and "COTS" almost conflict with each other... Off the shelf implies that the implimentation should be easy, while embedded implies integrated within a system.
I work with ceramic and PCB antennas all the time as an FAE. The datasheet for this and other PCB antennas typically describe free-space results. Not many recommendations are provided from the manufacturers on placement - since a radiator placed inside ANYTHING will behave differently with respect to impedance and radiation patterns.
Puse Engineering offers a wide variety of antenna products very similar to Toaglas and Antenova. IF you need more information on an equivalent, to this part number, go to the following website and request further info on the W3501 antenna. This antenna (not on the website) is a stand-alone radiator similar to the Taoglas antenna.http://www.pulseeng.com/index.php?354
If you have very low volume (available space for the antenna), then look for the W3502 - which takes advantage of the PCB that it is conencted to (via IPEX / U.FL connector).
Hope this helps!