Binningen commune (Basel Land half canton, Switzerland)

It is not really necessary to specify "palewise".  The 2,1 "rule" applies to any field with more or less similar proportions of height and width, such as a shield. The only actual rule is that "of plenitude", according to which charges must be represented in such a way as to (aesthetically) occupy as much as possible of the field on which they appear. So on a shield-shaped field, three charges fill best if depicted as 2 above 1 (the first two being usually represented somewhat smaller than the third).

Using the same rule for a pale, three charges would appear best "in pale" (which by the way is not exactly the same as "palewise" when speaking of more than one charge, the latter meaning in this case "orientated as a pale") so it is unnecessary to express this in the blazon: "Argent, on a pale Sable three mullets of six points of the field" would suffice.

Blazon by Mühlemann (1991): In Silber ein schwarzer Pfahl, belegt mit drei sechsstrahligen silbernen Sternen.