Single site admin vs network admin shouldn’t matter – those metaboxes only show for users who have the activate_plugins capability.
You can alter this by adding your own filter:
add_filter( 'generate_metabox_capability','generate_custom_metabox_capability' );
function generate_custom_metabox_capability()
{
return 'activate_plugins';
}
Here’s a list of capabilities: https://codex.wordpress.org/Roles_and_Capabilities
You’ll see “activate_plugins” as the first one under “Administrator”.
Are you sure you have those two metaboxes selected under “Screen Options”?