Taking at look at the perltidy sytle key this is the section that you need to refer to, (from web page http://perltidy.sourceforge.net/stylekey.html#braces%20right).

Indentation Style for Other Containers

You have a choice of two indentation schemes for non-block containers.
+ The default is to use a fixed number of spaces per indentation level
+ (the same number of spaces used for code blocks). Here is an example
+ of the default:

    $dbh = DBI->connect(
        undef, undef, undef,
        {
            PrintError => 0,
            RaiseError => 1
        }
    );

The alternate is to let the location of the opening paren (or square b
+racket, or curly brace) define the indentation, like this:

    $dbh = DBI->connect(
                         undef, undef, undef,
                         {
                           PrintError => 0,
                           RaiseError => 1
                         }
    );
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If you don't want that extra identation remove the -lp switch.

If you go down the Style key web page it will tell you how to set up all the switches for Perltidy. It presents the options in a if-elsif-else manor making it easy to understand and you go from top to bottom. So you go through the whole page, though you don't implment every switch along the way.