Create methods under / using CF for API Gateway - aws-cloudformation

Question

How do I create methods under API Gateway's root / folder using CF? So for example I have a Gateway that looks like the following:
/
OPTIONS
POST
However when trying to do that with CF I get:
Resource's path part only allow a-zA-Z0-9._- and curly braces at the beginning and the end. So my PathPart is the offending line.
ApiGate:
Type: AWS::ApiGateway::Resource
Properties:
ParentId: !GetAtt
- ApiGateApi
- RootResourceId
PathPart: '{/}'
RestApiId: !Ref ApiGateApi
I can change the PathPart to something else but then it creates it as a child object under / which is what I don't want.

Answer 1

Turns out after adding the following to my AWS::ApiGateway::Method it works now.
MyMethodOPTIONS:
Type: 'AWS::ApiGateway::Method'
Properties:
ResourceId: !GetAtt MyRestApi.RootResourceId
Here is more context into my Template:
ApiGatewayMethodOPTIONS:
Type: 'AWS::ApiGateway::Method'
Properties:
ResourceId: !GetAtt ApiGatewayRestApi.RootResourceId
RestApiId: !Ref ApiGatewayRestApi
AuthorizationType: NONE
HttpMethod: OPTIONS
Integration:
Type: MOCK
IntegrationResponses:
- ResponseParameters:
method.response.header.Access-Control-Allow-Headers: "'Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token'"
method.response.header.Access-Control-Allow-Methods: "'POST,OPTIONS'"
method.response.header.Access-Control-Allow-Origin: "'*'"
ResponseTemplates:
application/json: ''
StatusCode: '200'
PassthroughBehavior: NEVER
RequestTemplates:
application/json: '{"statusCode": 200}'
MethodResponses:
- ResponseModels:
application/json: Empty
ResponseParameters:
method.response.header.Access-Control-Allow-Headers: true
method.response.header.Access-Control-Allow-Methods: true
method.response.header.Access-Control-Allow-Origin: true
StatusCode: '200'
ApiGatewayRestApi:
Type: AWS::ApiGateway::RestApi
Properties:
ApiKeySourceType: HEADER
EndpointConfiguration:
Types:
- REGIONAL
Name: SearchAPI

Answer 2

This fixes my problem, in my case I needed to have 2 methods:
1. will respond to requests to root e.g. https://<api-url>/prod or https://<api-url>/prod/. This will use the RootResourceId of the API Gateway:
ResourceId: !GetAtt myApiGateway.RootResourceId
this will respond to requests to whatever has been set under https://<api-url>/prod/. Could be petstore or if using {proxy+} then the backend workload will try to resolve the request. It will refer to the Resource type defined in the template:
ResourceId: !Ref myResource