Hi Hammer. I have replied via email to you but just in case you didn't get it i'll add a few lines here as well.
The races that you select are controlled in the Quick Pick List in Gruss Betting Assistant and not TSM. To bet solely on place markets you would simply select place markets only in Gruss BA.
All the staking plans can be used for place markets. As the odds are generally shorter and the strike rate generally higher you would need to do a bit of research as to which staking plan is best suited for yourself.
I don't have plans at this stage to use the automated betting option on TSM, so (forgive any misunderstanding on my part) would I still require Gruss Betting Assistant? If not, how does TSM still cater for the Betfair place market?