Only problem I have seen with those list of machines, is that the Dell 2450 does not support PXE booting.
For the 1750 or 2650 simply make sure you have the PERC raid controller drivers and network card drivers, otherwise Windows will bluescreen on install.
What you mean is I need to integrate it in OEM directorie ? Do you have some exemple of unattend.txt sections and directories structure in $OEM$ because the doc is basic ? Thanks.
For the network card you need to use the $OEM$ directory ,for the raid controller its in the unattended.txt.
Its pretty simple to add the entries, and the documentation is correct in the manual (its how I figured it out).
I didn't grab the files I used at the last customer files, so I lack the examples of what we did there, unfortunantly.