How to label a multiple grids

I was searching for some way to label a grid and I found the topic formidableforms.com/knowledgebase/customize-html/#kb-add-labels-to-a-grid But I had the problem: I had more than 1 grid in the same form, and every time I fix a grid label dimension in one grid the others get mess, because the topic don't brings the solution to multiple grids with different columns numbers.

So, I was thinking... How to standardize the dimensions of the labels so that all grids have the titles in the right places?

The solution I found after almost give it up:

Put a HTML field with the classes: frm_form_field form-field  frm_grid_6 frm_top_container frm_grid

And put in the the content the code:

<label class="frm_primary_label"><span style="color:white;font-weight:bold">First label that you got to hide</span></label>
<div class="frm_opt_container">
<div class="frm_radio">Label 1</div>
<div class="frm_radio">Label 2</div>
<div class="frm_radio">Label 3</div>
<div class="frm_radio">Label 4</div>
<div class="frm_radio">Label 5</div>
</div>

Note: For other grids I just changed the number of columns in the class "frm_grid_6"