design related question

Hi there,

Just want to hear your thoughts (pros and cons) on placing qos appliance between the below choke points.

(a) appliance sitting between internal lan<->appliance<->dmz<->pix<->edge router<->wan cloud.


(b) appliance sitting between wan cloud<->edge router<->appliance<->dmz<->pix<->internal lan

Currently this appliance supports the following qos components w/ 45mbps support on eth0 and eth1:

-- shaping
-- buffering
-- policing

Any pointers to white papers, similar deployment, lesson learned or simply your feedback will be appreciated.