PAssing an array to a hash table, single item array failing - powershell

Question

I have the file below, which accepts an array of servers. Works well when there are multiple items in the array, and I note the answer that a user suggested in a previous post, which was to put a , in front of the values if its a single item array, trying that with a hash table just doesnt worked. I have tried various options without much luck.
param ([array[]]$servers = $(throw "Input array of servers.") , $folder )
$x = $servers
$k = 'serverid','servername','locationid','appid' # key names correspond to data positions in each array in $x
$h = #{}
For($i=0;$i -lt $x[0].length; $i++){
$x |
ForEach-Object{
[array]$h.($k[$i]) += [string]$_[$i]
}
}
$all_server_ids = $h['Serverid']
foreach ($server_id in $all_server_ids)
{
$severid = $h["serverid"][$all_server_ids.indexof($server_id)]
$servername = $h["servername"][$all_server_ids.indexof($server_id)]
$locationid = $h["locationid"][$all_server_ids.indexof($server_id)]
Write-Output "This $severid and this $servername and this $locationid"
}
Running the below.
.\test.ps1 -servers ,('72','Server1\DEV2','1.0') -folder "F:\files"
Getting the error
Cannot index into a null array.
+ $servername = $h["servername"][$all_server_ids.indexof($server_i ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : NullArray
Cannot index into a null array.
+ $locationid = $h["locationid"][$all_server_ids.indexof($server_i ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : NullArray
The issue here is that, I need the script to work with multiple items in the array or a single item.