Nothing loads until visitors say yes.

add_action( 'silvertrail_register', function () {
	silvertrail_register_service( 'google-tag-manager', [
		'tag_id' => 'GTM-XXXXXXX',
	] );
} );

add_filter( 'silvertrail_settings', function ( $settings ) {
	$settings['expiry_months'] = 12;
	return $settings;
} );

One call turns on the preset, and the official tag waits for consent.

<!-- Runs only after the visitor agrees to HubSpot -->
<script type="text/plain" data-silvertrail="hubspot"
	src="https://js.hs-scripts.com/123.js"></script>

Mark any script, and Silvertrail runs it after consent, in its original order.

$ wp silvertrail settings
+---------------+---------+---------+
| key           | value   | source  |
+---------------+---------+---------+
| enabled       | true    | default |
| layout        | "box"   | admin   |
| expiry_months | 12      | code    |
| records       | false   | default |
+---------------+---------+---------+

$ wp silvertrail validate
Success: The config is valid: 5 services.

Every value shows where it comes from: code, the admin or the default.

You
Turn on Google Tag Manager with GTM-XXXXXXX, keep
choices for 12 months and check the setup.

Agent
Added both to a small plugin. Checking it now.
$ wp silvertrail validate
Success: The config is valid: 5 services.

The agent writes the config in code and runs validate until it reports no problem.