$\mathit{Mathematica}$ makes no difference between column and row vectors, column and row matrices; they all are just lists. There are no column lists and no row lists in $\mathit{Mathematica}$.

In[13]:= muzahooM[n_Integer] := {Join[{v1, v2, v3}, ConstantArray[vRng, n - 6], {v4, v5, v6}]} /; n > 5

In[14]:= muzahooM[6]
Out[14]= {{v1, v2, v3, v4, v5, v6}}

In[15]:= MatrixQ[muzahooM[6]]
Out[15]= True

In[16]:= TensorRank[muzahooM[6]]
Out[16]= 2

In[17]:= Dimensions[muzahooM[6]]
Out[17]= {1, 6}

In[18]:= muzahooM[17]
Out[18]= {{v1, v2, v3, vRng, vRng, vRng, vRng, vRng, vRng, vRng, vRng,vRng, vRng, vRng, v4, v5, v6}}

In[19]:= MatrixQ[muzahooM[17]]
Out[19]= True

In[20]:= TensorRank[muzahooM[17]]
Out[20]= 2

In[21]:= Dimensions[muzahooM[17]]
Out[21]= {1, 17}