If we put anamul at slip we will be loosing a great fielder on the field but I am all for it even if 80% of the catches are hold onto in exchange. Naeem won't be around in ODIs when Shakib comes back judging his atrocious form in ODI.
Tamim probably has the safest pair of hands in this team but I have never seen him at slip and he probably isn't interested which is okay because he fields quite well in the outer circle.
Nasir should always be at point.
Shakib is good at mid on, mid off area. Mominul is another good one who should be at square/ or mid on mid off area. So it all comes down to Anamul pretty much.