I stack my noobs with my warrior & use my archer to plevel em.. I do the following procedure.
1) Place the noob at the (x,y) coordinate that I wish the stack to be located at.
2) Hop "off-screen" with the stacker, then hop back and make stacker do a RUN & SIT so that stacker sits on noob; (stacker placed at same x,y as noob).
3) repeat 1 & 2 for as many noobs.
PS: if ur stacker is in a guild, and any of the "stacked noobs" is in a guild, then there will be an obvious overlap of the player names, if the stacking is done right. confirming x,y coordinates for both noob and the stacker, is just for verification..
hope dat helps