PDO Cannot use ? parameter substition for query OFFSET, only for data value [duplicate]

Question

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• How to apply bindValue method in LIMIT clause? 9 answers
• How do I use pdo's prepared statement for order by and limit clauses? 4 answers

I'm trying to use the ? instead of binding a value because you can't mix ? and :binds in the same query and I need to use ? for the array I'm imploding within the query.

//Set values
$limit = 5;
$offset = 2;
$location = array("Cornwall", "Devon", "Dorset", "Norfolk & Suffolk", "Somerset", "Wiltshire");

//Sort the array by adding ?
$qMarks = str_repeat('?,', count($location) - 1) . '?';

//Query using ? because you can't mix them in a query
$location[] = (int)$limit;
$location[] = (int)$offset;
$sql = $conn->prepare("SELECT * FROM adverts WHERE location IN ($qMarks) AND status = 2 LIMIT ? OFFSET ?");
$sql->execute($location);
$adverts=$sql->fetchAll();

This should insert each string in the array into the query and on the end add the $limit & $offset variables.

When I dump the query it seems to be displaying as I want it has each of the array items and then has the last two for the limit and offset but doesn't run;

array(8) { [0]=> string(8) "Cornwall" [1]=> string(5) "Devon" [2]=> string(6) "Dorset" [3]=> string(17) "Norfolk & Suffolk" [4]=> string(8) "Somerset" [5]=> string(9) "Wiltshire" [6]=> int(5) [7]=> int(2) }

This is the error I'm getting with the code;

PHP Fatal error:  Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''5' OFFSET '0'' at line 1' in /advert.php:30
Stack trace:
#0 advert.php(30): PDOStatement->execute(Array)
#1 {main}
  thrown in advert.php on line 30