PDF Structure using tcpdf - php

Question

I am creating PDF file with custom structure/layout using TCPDF library. Data is coming from server side and data is being displayed data in tabular form in PDF file.
PDF structure should be look like this
Required PDF structure
Based on my code. PDF structure/PDF structure based on my code
Actually, I this this layout in PDF file
Sheet Size : 210x297 mm (A4)
Format 6 (Row) x 3 (Col)
Label Size : 63.5 x 46.6
Margins : Left 7 mm, Right 8 mm, Gutter 2 mm
Top 10.4 mm Bottom 7 mm
I am using sheet size like this
$pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, array('210', '297'), true, 'UTF-8', false);
I am using Label (First column) size like this. I don't know it's correct or not but it looks like correct.
$subhtml .= '<td border="0" width="63.5mm" height="46.6mm style="float:left;text-align:left;">
I am using Margins (Left, Right,Top) like this and I don't know how to give gutter (space between two columns)
$pdf->SetMargins(7, 10.4, 8);
Bottom 7 MM like this
$pdf->SetFooterMargin(7);
PROBLEMS
Left side space is not same as in required PDF structure file.
How to give gutter/space between two columns.
All above code are correct or not?
Complete Code
$sql = "SELECT * FROM Members where MemberId in (select MemberId from Normalized_Category where Category IN (".addQuotes($categories)."))";
$result = mysqli_query($conn, $sql);
while($rows = mysqli_fetch_assoc($result)){
$members[] = $rows;
}
$subhtml ='';
$i = 1;
$j = 3;
$html ='';
foreach($members as $value){
$subhtml .= '<td border="0" width="63.5mm" height="46.6mm" style="float:left;text-align:left;">
<span>'.$value['MemberId'].'</span>
<span style="float:right; text-align:right;">'.$value['Expiry_Date'].'</span>
<br/><b>
<span>'.$value['Salute'].' '.$value['Name'].'</span>
</b><br/>
<span>'.$value['Address1'].','.$value['Address2'].','.$value['Address3'].' </span>
<br/><span>'.$value['City'].' '.$value['PinCode'].' - '.$value['State'].'</span><br/>
<span>'.$value['Contact'].'</span><br/></td>';
if ($i % $j == 0) {
$subhtml .= '</tr><tr>';
}
$i++;
}
$tbl = <<<EOD
<table border="0" cellpadding="2" align="justify">
<tr nobr="true">
<th colspan="3"></th>
</tr>
<tr nobr="true">
$subhtml
</tr>
</table>
EOD;
require('tcpdf/tcpdf.php');
$pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, array('210', '297'), true, 'UTF-8', false);
$pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);
$pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);
$pdf->setPrintHeader(false);
$pdf->setPrintFooter(false);
$pdf->SetMargins(7, 10.4, 8); // left = 2.5 cm, top =
$pdf->SetFooterMargin(7);
if (#file_exists(dirname(__FILE__).'/lang/eng.php')) {
require_once(dirname(__FILE__).'/lang/eng.php');
$pdf->setLanguageArray($l);
}
$pdf->SetFont('helvetica', '', 9);
$pdf->AddPage();
$pdf->writeHTML($tbl, true, false, false, false, '');
$pdf->Output('Members.PDF', 'D');